--Who ______ to clean the classroom last...

--Who ______ to clean the classroom last weekend?

-- Li Lin.

A. helps B. helped

C. is helping D. will help

B 【解析】试题分析：句意：－上周末谁帮忙打扫的教室？－李林。A. helps一般现在时态；B. helped一般过去时态；C. is helping现在进行时态；D. will help一般过去时态。本题描述的是上周末发生的过去动作，用一般过去时态。故选B。考点：考查动词的时态。

考点分析：

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